CN110854922A - System and method for evaluating new energy accepting capability of regional power grid based on ant colony algorithm - Google Patents
System and method for evaluating new energy accepting capability of regional power grid based on ant colony algorithm Download PDFInfo
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Abstract
The invention belongs to the technical field of power grids, and discloses a system and a method for evaluating new energy accepting capability of a regional power grid based on an ant colony algorithm, wherein the system for evaluating new energy accepting capability of the regional power grid based on the ant colony algorithm comprises the following steps: the system comprises an energy monitor, a power grid monitor, a computer, a grid connection module, a load monitoring module, a load distribution module and an evaluation module. According to the invention, the existing power transmission network resources are optimally distributed and utilized through the grid-connected module, the consumption capacity of new energy is improved, and the structure of a power grid is perfected; meanwhile, the total cost of the micro-grid power generation is minimized while the conditions of the micro-grid safe operation constraints and the load requirements are met through the load distribution module. Meanwhile, loads are classified and refined according to different requirements of users on electric energy supply, diversified electric energy supply in the micro-grid can be effectively utilized, and the running economy of the micro-grid system is optimized.
Description
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a regional power grid new energy receiving capacity evaluation system and method based on an ant colony algorithm.
Background
The whole of the substation and the transmission and distribution line of various voltages in the power system is called a power grid. The system comprises three units of power transformation, power transmission and power distribution. The task of the power grid is to deliver and distribute electrical energy, changing the voltage. However, the existing regional power grid new energy receiving capacity evaluation system lacks comprehensive technical economic evaluation indexes and methods suitable for planning of a high-permeability throughput type power transmission system for power grid planning; the existing power system planning method cannot comprehensively balance the contradiction between the accepting capacity and the operation reliability level; the existing method does not comprehensively consider the problem of change of available transmission capacity of a power transmission system caused by grid connection of an intermittent power source, and the like; meanwhile, the load distribution to the microgrid is unbalanced.
In summary, the problems of the prior art are as follows: the existing regional power grid new energy receiving capacity evaluation system lacks comprehensive technical economic evaluation indexes and methods suitable for planning of a high-permeability throughput type power transmission system for power grid planning; the existing power system planning method cannot comprehensively balance the contradiction between the accepting capacity and the operation reliability level; the existing method does not comprehensively consider the problem of change of available transmission capacity of a power transmission system caused by grid connection of an intermittent power source, and the like; meanwhile, the load distribution to the microgrid is unbalanced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an ant colony algorithm-based regional power grid new energy receiving capacity evaluation system.
The invention is realized in such a way that an ant colony algorithm-based regional power grid new energy accepting capability assessment method comprises the following steps:
firstly, controlling each device and each module to work normally by a computer; merging the power grid and the new energy through a grid connection module; the grid connection method of the grid connection module comprises the following steps:
(1) constructing a new energy access capacity and access point optimization model through a construction program; by adopting multi-objective integer nonlinear programming, two groups of integer variables are set:
A. 0-1 variable lambdaiControlling whether the i point is accessed to new energy, lambdai0 means no access; lambda [ alpha ]iAccess is indicated by 1;
B、nijrepresenting a building line between the nodes i and j, wherein the value of the building line is an integer between 0 and m, and m represents the number of allowed expansion lines of the power transmission corridor;
(2) establishing a power transmission system planning evaluation index system considering new energy grid connection; evaluating and calculating each index of the planning alternative scheme set which meets the basic technical and economic requirements;
weighting and integrating the indexes to obtain the quality sequence of alternative schemes to obtain an optimal scheme;
the power transmission system planning evaluation index system comprises 4 first-level indexes, 9 second-level indexes and 13 third-level indexes;
(3) constructing a double-layer planning model of the power transmission system with the aim of improving the capacity of accepting new energy as an optimization target; the upper layer planning model determines a network frame scheme aimed at by the lower layer planning model, and the lower layer planning model reflects the bearing capacity of uncertainty factors of the upper layer planning model; the power transmission system double-layer planning model taking improvement of new energy accepting capacity as an optimization target determines a power transmission system planning scheme description as an upper layer model with the aim of minimizing investment cost;
carrying out careful safety check on the obtained optimized planning scheme under the uncertainty conditions of the output uncertainty of the intermittent power supply, group correlation, load fluctuation uncertainty, random component outage and the like so as to ensure the adaptability of the power transmission planning scheme;
(4) an optimization decision method for improving the capacity of an available transmission channel of a power transmission system considering new energy grid connection is provided;
secondly, monitoring the load information of the power grid through a load monitoring module, wherein the load distribution module distribution method comprises the following steps:
1) inputting an input power function and a load of a micro power supply in the micro power grid through a model building program, and building a mathematical model of the output power of the micro power supply in the micro power grid;
2) calculating a power difference on load distribution power by using each micro power supply, judging whether a transaction exists with a large power grid or not, if the transaction exists, determining that the transaction exists as a grid-connected model, and if the transaction does not exist as an island model, then listing out a target function in the grid-connected model and the island model respectively;
3) and designing the implementation of the load distribution of the micro-grid according to the ant colony algorithm.
2. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm as claimed in claim 1, wherein before the first step is carried out, the following steps are carried out: monitoring new energy information data through an energy monitor; and monitoring the voltage, current and power data information of the power grid through a power grid monitor.
Further, in the second step, the microgrid in step 1) comprises 3 types of micro power sources including a wind turbine set, a photovoltaic battery set and a micro fuel wheel.
Further, the output power of the micro power supply comprises: output power P of wind turbinewThe functional relationship with the actual wind speed V is:
in the formula, V is the actual wind speed; vrRated wind speed; vinTo cut into the wind speed; voutCutting out the wind speed; prThe rated output power of the fan.
Further, the power output expression of the photovoltaic battery pack is
In the formula, PPVIs the true output power under operating conditions; pSTCThe output power of the battery under the common standard condition; gingThe actual irradiation intensity of sunlight; gstcThe irradiation intensity under the condition of a common mark; k is the coefficient of power temperature; tc is the test temperature of the cell panel in operation; t isrIs the temperature under the conditions of the common standard.
Further, the overall efficiency function of the micro gas turbine is
In the formula PneFor effective power output, Pth.reeFor the purpose of restoring thermal power, LHVfIs the combustion coefficient of the fuel, mfIs the actual mass of the fuel.
Further, after monitoring the grid load information in the second step, the following steps are required:
step 1, distributing the load of a power grid through a load distribution module;
and 2, evaluating the capacity of the regional power grid for receiving the new energy by using an evaluation program through an evaluation module.
Another object of the present invention is to provide an ant colony algorithm-based regional power grid new energy receiving capability evaluation system, which includes:
the system comprises an energy monitor, a power grid monitor, a computer, a grid-connected module, a load monitoring module, a load distribution module and an evaluation module;
the energy monitor is connected with the computer and used for monitoring new energy information data;
the power grid monitor is connected with the computer and used for monitoring data information of voltage, current and power of a power grid;
the computer is connected with the energy monitor, the power grid monitor, the grid-connected module, the load monitoring module, the load distribution module and the evaluation module and is used for controlling each device and each module to work normally;
the grid-connected module is connected with the computer and used for merging the power grid and the new energy;
the load monitoring module is connected with the computer and used for monitoring the load information of the power grid;
the load distribution module is connected with the computer and used for distributing the load of the power grid;
and the evaluation module is connected with the computer and used for evaluating the capacity of the regional power grid for receiving the new energy through an evaluation program.
The invention further aims to provide an information data processing terminal for implementing the ant colony algorithm-based regional power grid new energy receiving capacity evaluation method.
Another object of the present invention is to provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to execute the method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm.
The invention has the advantages and positive effects that: according to the invention, the optimal capacity of the new energy access system is determined through the grid-connected module and the grid-connected access point is reasonably selected, so that the safe and reliable operation of the system is ensured, the resources can be fully utilized, after the new energy is connected to the grid, the existing power transmission network resources are optimally distributed and utilized on the premise of ensuring the safe operation of the system during system scheduling, the consumption capacity of the new energy is improved, and the structure of a power grid is perfected; meanwhile, the total cost of the micro-grid power generation is minimized while the conditions of the micro-grid safe operation constraints and the load requirements are met through the load distribution module. Meanwhile, loads are classified and refined according to different requirements of users on electric energy supply, diversified electric energy supply in the micro-grid can be effectively utilized, and the running economy of the micro-grid system is optimized.
Drawings
Fig. 1 is a structural block diagram of a system for evaluating new energy admission capacity of a regional power grid based on an ant colony algorithm according to an embodiment of the present invention.
In the figure: 1. an energy source monitor; 2. a power grid monitor; 3. a computer; 4. a grid connection module; 5. a load monitoring module; 6. a load distribution module; 7. and an evaluation module.
Fig. 2 is a flowchart of a method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm according to the embodiment of the invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are exemplified and included in the detailed description with reference to the accompanying drawings.
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the system for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm provided by the embodiment of the present invention includes: the system comprises an energy monitor 1, a power grid monitor 2, a computer 3, a grid-connected module 4, a load monitoring module 5, a load distribution module 6 and an evaluation module 7.
And the energy monitor 1 is connected with the computer 3 and used for monitoring new energy information data.
And the power grid monitor 2 is connected with the computer 3 and is used for monitoring data information of voltage, current and power of the power grid.
And the computer 3 is connected with the energy monitor 1, the power grid monitor 2, the grid-connected module 4, the load monitoring module 5, the load distribution module 6 and the evaluation module 7 and is used for controlling each device and each module to work normally.
And the grid-connected module 4 is connected with the computer 3 and is used for merging the power grid and the new energy.
And the load monitoring module 5 is connected with the computer 3 and is used for monitoring the load information of the power grid.
And the load distribution module 6 is connected with the computer 3 and is used for performing distribution operation on the power grid load.
And the evaluation module 7 is connected with the computer 3 and is used for evaluating the new energy accepting capacity of the regional power grid through an evaluation program.
Fig. 2 illustrates an ant colony algorithm-based method for evaluating the new energy accepting capability of a regional power grid, which includes:
s101, monitoring new energy information data through an energy monitor; and monitoring the voltage, current and power data information of the power grid through a power grid monitor.
S102, controlling each device and each module to normally work by a computer; merging the power grid and the new energy through a grid connection module; and monitoring the load information of the power grid through a load monitoring module.
And S103, distributing the power grid load through the load distribution module.
And S104, evaluating the capacity of the regional power grid for receiving the new energy by using an evaluation program through an evaluation module.
The invention is further described with reference to specific examples.
Example 1
The grid connection method of the grid connection module 4 provided by the invention comprises the following steps:
(1) and constructing a new energy access capacity and access point optimization model through a construction program.
(2) And establishing a power transmission system planning evaluation index system considering new energy grid connection.
(3) And constructing a double-layer planning model of the power transmission system with the aim of improving the capacity of accepting new energy as an optimization target.
(4) And providing an optimization decision method for improving the capacity of the available transmission channel of the power transmission system considering new energy grid connection.
In the step (1), a multi-objective integer nonlinear programming is adopted for constructing a new energy access capacity and access point optimization model, and two groups of integer variables are set:
A. 0-1 variable lambdaiControlling whether the i point is accessed to new energy, lambdai0 means no access; lambda [ alpha ]iAnd 1 denotes access.
B、nijRepresenting a building line between nodes i and j, with values of integers between 0 and m representing the number of allowed expansion lines of the power transmission corridor.
In the step (2), a power transmission system planning evaluation index system considering new energy grid connection is established and comprises 4 first-level indexes, 9 second-level indexes and 13 third-level indexes.
In the step (2), the method for establishing the power transmission system planning evaluation index system considering new energy grid connection comprises the following two steps:
and evaluating and calculating each index for the planning alternative solution set which meets the basic technical and economic requirements.
And performing weighted integration on the indexes to obtain the quality sequence of the alternative schemes and obtain the optimal scheme.
In the step (3), the double-layer planning model of the power transmission system, which takes the capacity of accepting new energy resources as the optimization target, is improved, the upper layer planning model determines the network grid structure scheme aimed at by the lower layer planning model, and the lower layer planning model reflects the bearing capacity of uncertainty factors of the upper layer planning model.
In the step (3), the method for constructing the double-layer planning model of the power transmission system with the aim of improving the new energy accepting capacity as the optimization goal comprises the following steps:
determining a power transmission system planning scheme description as an upper model by taking the minimization of investment cost as a target;
and carrying out careful safety check on the obtained optimized planning scheme under the uncertain conditions of the output uncertainty of the intermittent power supply, group correlation, load fluctuation uncertainty, random component outage and the like so as to ensure the adaptability of the power transmission planning scheme.
Example 2
The load distribution module 6 distribution method provided by the invention comprises the following steps:
1) and (4) inputting the input power function and the load of the micro power supply in the micro power grid through a model building program to construct an output power mathematical model of the micro power supply in the micro power grid.
2) And calculating a power difference on the load distribution power by utilizing each micro power supply, judging whether a transaction exists with a large power grid or not, if the transaction exists, determining that the transaction exists as a grid-connected model, and if the transaction does not exist as an island model, then listing out a target function in the grid-connected model and the island model respectively.
3) And designing the implementation of the load distribution of the micro-grid according to the ant colony algorithm.
In step 1), the microgrid comprises a microgrid of the type of a wind turbine generator, a photovoltaic battery pack and a micro-fuel wheel 3, and the specific output power of the microgrid comprises:
1) output power P of wind turbinewThe functional relationship with the actual wind speed V is:
in the formula, V is the actual wind speed; vrRated wind speed; vinTo cut into the wind speed; voutCutting out the wind speed; prThe rated output power of the fan.
2) The power output expression of the photovoltaic battery pack is
In the formula, PPVIs the true output power under operating conditions; pSTCThe output power of the battery under the common standard condition; gingThe actual irradiation intensity of sunlight; gstcThe irradiation intensity under the condition of a common mark; k is the coefficient of power temperature; tc is the test temperature of the cell panel in operation; t isrIs the temperature under the condition of a common standard;
3) the overall efficiency function of the micro gas turbine is
In the formula PneFor effective power output, Pth.reeFor the purpose of restoring thermal power, LHVfIs the combustion coefficient of the fuel, mfIs the actual mass of the fuel.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm is characterized by comprising the following steps of:
firstly, controlling each device and each module to work normally by a computer; merging the power grid and the new energy through a grid connection module; the grid connection method of the grid connection module comprises the following steps:
(1) constructing a new energy access capacity and access point optimization model through a construction program; by adopting multi-objective integer nonlinear programming, two groups of integer variables are set:
A. 0-1 variable lambdaiControlling whether the i point is accessed to new energy, lambdai0 means no access; lambda [ alpha ]iAccess is indicated by 1;
B、nijrepresenting a building line between the nodes i and j, wherein the value of the building line is an integer between 0 and m, and m represents the number of allowed expansion lines of the power transmission corridor;
(2) establishing a power transmission system planning evaluation index system considering new energy grid connection; evaluating and calculating each index of the planning alternative scheme set which meets the basic technical and economic requirements;
weighting and integrating the indexes to obtain the quality sequence of alternative schemes to obtain an optimal scheme;
the power transmission system planning evaluation index system comprises 4 first-level indexes, 9 second-level indexes and 13 third-level indexes;
(3) constructing a double-layer planning model of the power transmission system with the aim of improving the capacity of accepting new energy as an optimization target; the upper layer planning model determines a network frame scheme aimed at by the lower layer planning model, and the lower layer planning model reflects the bearing capacity of uncertainty factors of the upper layer planning model; the power transmission system double-layer planning model taking improvement of new energy accepting capacity as an optimization target determines a power transmission system planning scheme description as an upper layer model with the aim of minimizing investment cost;
carrying out careful safety check on the obtained optimized planning scheme under the uncertainty conditions of the output uncertainty of the intermittent power supply, group correlation, load fluctuation uncertainty, random component outage and the like so as to ensure the adaptability of the power transmission planning scheme;
(4) an optimization decision method for improving the capacity of an available transmission channel of a power transmission system considering new energy grid connection is provided;
secondly, monitoring the load information of the power grid through a load monitoring module, wherein the load distribution module distribution method comprises the following steps:
1) inputting an input power function and a load of a micro power supply in the micro power grid through a model building program, and building a mathematical model of the output power of the micro power supply in the micro power grid;
2) calculating a power difference on load distribution power by using each micro power supply, judging whether a transaction exists with a large power grid or not, if the transaction exists, determining that the transaction exists as a grid-connected model, and if the transaction does not exist as an island model, then listing out a target function in the grid-connected model and the island model respectively;
3) and designing the implementation of the load distribution of the micro-grid according to the ant colony algorithm.
2. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm as claimed in claim 1, wherein before the first step is carried out, the following steps are carried out: monitoring new energy information data through an energy monitor; and monitoring the voltage, current and power data information of the power grid through a power grid monitor.
3. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm as claimed in claim 1, wherein in the second step, the micro-grid in step 1) comprises all the micro-power sources of 3 types including a wind turbine set, a photovoltaic battery set and a micro-fuel wheel.
4. The method for evaluating the capability of receiving new energy for the regional power grid based on the ant colony algorithm as claimed in claim 3, wherein the output power of the micro power supply comprises: output power P of wind turbinewThe functional relationship with the actual wind speed V is:
in the formula, V is the actual wind speed; vrRated wind speed; vinTo cut into the wind speed; voutCutting out the wind speed; prThe rated output power of the fan.
5. The method for evaluating new energy receiving capacity of regional power grid based on ant colony algorithm as claimed in claim 3, wherein the power output expression of the photovoltaic battery pack is
In the formula, PPVIs the true output power under operating conditions; pSTCThe output power of the battery under the common standard condition; gingThe actual irradiation intensity of sunlight; gstcThe irradiation intensity under the condition of a common mark; k is the coefficient of power temperature; tc is the test temperature of the cell panel in operation; t isrIs the temperature under the conditions of the common standard.
6. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm as claimed in claim 3, wherein the total efficiency function of the micro gas turbine is
In the formula PneFor effective power output, Pth.reeFor the purpose of restoring thermal power, LHVfIs the combustion coefficient of the fuel, mfIs the actual mass of the fuel.
7. The method for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm as claimed in claim 1, wherein after monitoring the power grid load information in the second step, the following steps are carried out:
step 1, distributing the load of a power grid through a load distribution module;
and 2, evaluating the capacity of the regional power grid for receiving the new energy by using an evaluation program through an evaluation module.
8. The system for evaluating the new energy accepting capability of the regional power grid based on the ant colony algorithm is characterized by comprising the following steps of:
the energy monitor is connected with the computer and used for monitoring new energy information data;
the power grid monitor is connected with the computer and used for monitoring data information of voltage, current and power of a power grid;
the computer is connected with the energy monitor, the power grid monitor, the grid-connected module, the load monitoring module, the load distribution module and the evaluation module and is used for controlling each device and each module to work normally;
the grid-connected module is connected with the computer and used for merging the power grid and the new energy;
the load monitoring module is connected with the computer and used for monitoring the load information of the power grid;
the load distribution module is connected with the computer and used for distributing the load of the power grid;
and the evaluation module is connected with the computer and used for evaluating the capacity of the regional power grid for receiving the new energy through an evaluation program.
9. An information data processing terminal for realizing the ant colony algorithm-based regional power grid new energy receiving capacity evaluation method.
10. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the ant colony algorithm-based regional power grid new energy reception capability assessment method of any one of claims 1-7.
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| CN113346487A (en) * | 2021-06-09 | 2021-09-03 | 国网吉林省电力有限公司 | Source-load matching method, system and equipment based on multi-source complementation |
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| CN110445180A (en) * | 2019-09-03 | 2019-11-12 | 国网河南省电力公司信阳供电公司 | A kind of new-energy grid-connected method |
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| CN104881716A (en) * | 2015-05-28 | 2015-09-02 | 贵州电网公司电网规划研究中心 | Optimization programming and evaluation method of micro-grid power supply |
| CN109245152A (en) * | 2018-08-31 | 2019-01-18 | 昆明理工大学 | A kind of micro-grid load distribution method based on multiple target ant group algorithm |
| CN110445180A (en) * | 2019-09-03 | 2019-11-12 | 国网河南省电力公司信阳供电公司 | A kind of new-energy grid-connected method |
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| CN113346487A (en) * | 2021-06-09 | 2021-09-03 | 国网吉林省电力有限公司 | Source-load matching method, system and equipment based on multi-source complementation |
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